$highlight-color:#F90;
.selected{
    border: 1px solid $highlight-color;
}
.p1{
    background-color: $highlight-color;
}
#content {
    article {
      h1 { color: #333 }
      p  { margin-bottom: 1.4em }
    }
      aside { background-color: #EEE }
  }

article a {
    color: blue;
    :hover { color: red }
  }


  article a {
    color: blue;
    &:hover { color: red }
  }  